5 Choose the correct modal verb.
   1    The temperature is dropping. It could / must to snow during the night.
   2    I don’t have a special plan for tonight. After work, I might / have to go home.
   3    My son has just cut his hand badly. I have to / should take him to the hospital.
   4    The dog keeps going to the door. I think you had to / should take him for a walk.
   5    You don’t have / mustn’t be late for school!
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